That + a DP and catback exhaust system with a tune will increase HP and performance. Pretty good too. You are primarily changing the air flow system....more free flow. I can't comment on the MPG as I have not done this because it isn't made for the North American SH.....even though it may say so in the accessory catalog, it will not work. The MAF sensor will not attach to it. Not sure about Canada/BC but another member here that lives in Brazil bought it here in the states....dealer told him it would work, I said otherwise. He confirmed it with SOA, will not work. JMHO don't waste your time or $$ on it for now, unless something has changed.